Reithrodontomys montanus (Baird, 1855) . Proc. Acad. Nat. Sci. Phila., 7:335.

TYPE LOCALITY: U.S.A., Colorado, either Saguache Co., upper end of San Luis Valley or Alamosa Co., Medaño Creek .

DISTRIBUTION: N. Durango and N.E. Sonora (Mexico) to N.W. South Dakota, E.C. Texas, and S.W. Missouri (U.S.A.).

COMMENT: Subgenus Reithrodontomys; see Hooper, 1952, Mise. Publ. Mus. Zool. Univ. Mich., 77:1 -255. For type locality information see Hall, 1981: 636.

ISIS NUMBER: 5301410008047013001.